package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.SkusHasStockVo;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;


    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;


    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        // 变为已解锁
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);
    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        /**
         * skuId:
         * wareId:
         */
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    /**
     * 采购成功进行入库操作
     *
     * @param skuId  采购商品id
     * @param wareId 仓库id
     * @param skuNum 采购数量
     */
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 1.判断如果还没有这个商品的库存记录，那就是新增
        List<WareSkuEntity> skuEntityList = wareSkuDao.selectList(
                new QueryWrapper<WareSkuEntity>()
                        .eq("sku_id", skuId)
                        .eq("ware_id", wareId));
        if (skuEntityList == null || skuEntityList.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            // TODO 调用商品服务，查询商品名称 如果失败，整个事务无需回滚
            // 1.出现异常直接catch
            // TODO 第2种方式在高级讲
            try {
                R r = productFeignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) r.get("skuInfo");
                if (r.getCode() == 0) {
                    wareSkuEntity.setSkuName(data.get("skuName") + "");
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }


    /**
     * 查询sku是否有库存
     *
     * @param skuIds
     * @return
     */
    @Override
    public List<SkusHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkusHasStockVo> collect = skuIds.stream().map(sku -> {
            SkusHasStockVo vo = new SkusHasStockVo();

            // 查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(sku);

            vo.setSkuId(sku);
            vo.setHasStock(count == null ? false : count > 0);

            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 根据订单号,锁定所有订单项的库存
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * @param vo 库存解锁的场景
     *           1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     *           <p>
     *           <p>
     *           2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *           之前锁定的库存就要自动解锁。
     *           (rollbackFor = NoStockException.class)
     *           默认只要是运行时异常都会回滚
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情。
         * 追溯。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        // 1.找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            // 查询这个商品在哪个仓库有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            stock.setNum(item.getCount());
            return stock;
        }).collect(Collectors.toList());


        // 2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            // 默认当前商品没有被锁住:false;锁住了:true
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //     1： 1 - 2 - 1   2：2-1-2  3：3-1-1(x)
            for (Long wareId : wareIds) {
                // 库存锁定成功返回1;失败返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    // 锁住了   如果有一个仓库中的库存数量刚好足够,也刚好被锁住了,那么其他仓库就不需要锁定库存了
                    skuStocked = true;
                    // TODO 告诉MQ库存锁定成功,触发自动解锁逻辑
                    // 保存锁定成功的详情
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(
                            null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    // 发送消息
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁定失败,尝试下一个仓库
                }
            }
            if (!skuStocked) {
                // 当前商品所有仓库都没有库存了,库存锁定失败
                throw new NoStockException(skuId);
            }
        }

        // 3.所有商品库存全部锁定成功
        return true;
    }


    /**
     * 1.库存自动解锁
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁。
     * 2.订单失败
     * 锁库存失败
     * <p>
     * <p>
     * 只要解锁库存的消息失败,一定要告诉服务解锁失败,消息不要删除
     *
     * @param to
     */
    @Override
    public void unLockStock(StockLockedTo to) {
        // 当前商品订单详情
        StockDetailTo detail = to.getDetail();

        Long detailId = detail.getId();
        // 解锁
        // 1.查询数据库关于这个订单的锁定库存信息
        // 有;   证明库存锁定成功
        //      解锁:订单情况
        //          1.没有这个订单,必须解锁
        //          2.有这个订单.不是解锁库存
        //              判断订单状态:     已取消:解锁库存
        //                              没取消:不能解锁
        // 没有;没有就是库存锁定失败,库存回滚了,这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            // 根据订单号查询订单的状态
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 订单不存在也要解锁库存;订单已经被取消,才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        // 当前库存工作单详情,状态是已锁定,但是未解锁状态才能解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                // 拒绝消息以后,重新放到队列中,让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            // 无需解锁
        }
    }

    /**
     * 解锁订单
     * <p>
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
     * 导致卡顿的订单，永远不能解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查询最新库存状态,防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        // 按照工作单找到所有没有解锁的库存,进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    /**
     * 当前商品在哪些仓库中有库存entity
     */
    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}